dlci: validate the net device in dlci_del()

We triggered an oops while running trinity with 3.4 kernel:

BUG: unable to handle kernel paging request at 0000000100000d07
IP: [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
PGD 640c0d067 PUD 0
Oops: 0000 [#1] PREEMPT SMP
CPU 3
...
Pid: 7302, comm: trinity-child3 Not tainted 3.4.24.09+ 40 Huawei Technologies Co., Ltd. Tecal RH2285          /BC11BTSA
RIP: 0010:[<ffffffffa0109738>]  [<ffffffffa0109738>] dlci_ioctl+0xd8/0x2d4 [dlci]
...
Call Trace:
  [<ffffffff8137c5c3>] sock_ioctl+0x153/0x280
  [<ffffffff81195494>] do_vfs_ioctl+0xa4/0x5e0
  [<ffffffff8118354a>] ? fget_light+0x3ea/0x490
  [<ffffffff81195a1f>] sys_ioctl+0x4f/0x80
  [<ffffffff81478b69>] system_call_fastpath+0x16/0x1b
...

It's because the net device is not a dlci device.

Reported-by: Li Jinyue <lijinyue@huawei.com>
Signed-off-by: Li Zefan <lizefan@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c
index 1f6e053..6a8a382 100644 (file)
--- a/drivers/net/wan/dlci.c
+++ b/drivers/net/wan/dlci.c
@@ -384,6 +384,7 @@ static int dlci_del(struct dlci_add *dlci)
        struct frad_local       *flp;
        struct net_device       *master, *slave;
        int                     err;
+       bool                    found = false;
 
        rtnl_lock();
 
@@ -394,6 +395,17 @@ static int dlci_del(struct dlci_add *dlci)
                goto out;
        }
 
+       list_for_each_entry(dlp, &dlci_devs, list) {
+               if (dlp->master == master) {
+                       found = true;
+                       break;
+               }
+       }
+       if (!found) {
+               err = -ENODEV;
+               goto out;
+       }
+
        if (netif_running(master)) {
                err = -EBUSY;
                goto out;